MLA

Hamilton, William Hamilton, 2nd Duke of, 1616-1651, Lambert, John, 1619-168. A true coppy of a letter sent from Dvke Hamilton, from Perith in England to Master William Crofts : expressing the present condition of the Scottish army .... 1651. https://collections.library.yale.edu/catalog/2019740.

APA, 6th edition

Hamilton, William Hamilton, 2nd Duke of, 1616-1651, & Lambert, John, 1619-168. (1651)[A true coppy of a letter sent from Dvke Hamilton, from Perith in England to Master William Crofts : expressing the present condition of the Scottish army ...]. https://collections.library.yale.edu/catalog/2019740.